code: def unary(self, n: int) -> int:
      return n
  
imports: import sys
  from typing import AsyncGenerator, Generator
  import pytest
  from ray import serve
  from ray.serve import Deployment
  from ray.serve.handle import RayServeHandle
label_desc: Use image node_id 4 for calling the SyncStreamer obj's underlying member method code with example usage: obj.unary(n) and returns: n